[Bug tree-optimization/67953] [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67953

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Thu Oct 15 09:39:35 2015
New Revision: 228839

URL: https://gcc.gnu.org/viewcvs?rev=228839&root=gcc&view=rev
Log:
        PR tree-optimization/67953
        * match.pd (X - (X / Y) * Y): Don't change signedness of @0.

        * gcc.dg/fold-minus-6.c (fn4): Change the type of A to
        unsigned.
        * gcc.dg/torture/pr67953.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr67953.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/fold-minus-6.c